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H. E. CHURCHILL.

TEMPERATURE NTHOLUNG DEViCE. neue/mou mio :uw 3, |916.

1,377,750. Patented Maylo, 1921.

attmuq# :.UNrrE nTall fwftom tlmay concern;

residing at Detroit, inthe county ofWayne "andfstate of Michigan, have inventedl certainnew and useful Improvements in Temperature-Controlling lDevicesyof which the folloiviiigris a specifi/cation, reference being -i `had therein to the'acc'ompanying d1javvi 1 i gs. fY

stem L', the latter can be adjusted -toward his invention relates to temperature controlling v,devices and refers more particularl'y. to animproved'arrangement f` r automatxcally controlling refrigeratin ap aratus, aspects's not necessarily limited to the particular use specified.

Among the objects of the' invention are to provide means for automatically opening e and closing an electric circuit or other con:

trolling means upon any material change from'a predetermined relatively lowr tem- 4perature; to utilize an ex'pansble dia hrigm for making or breaking the circuit, t is 1a-V phrag'm containing a relatively low Yboiling dpoint liquid, such as sulfur dioxid; to provide a constructionin which the diaphragm or other thermostatic member is operated by V the expansion of saturated vapor, there being'preferably suliicient of the liquid thatall of suchliquid can not. be va orizedr before thev pressure actsto stop rthervaf Orization" to rovde arefri rater,l con- Atrolling device 4that can be economically manufactured and which will effectively maintainthe' desired temperature; and m general to provide a new and improved conf trolling device yot' the character above' re erred to.

The invention fturtherresides in such features :of constructron and arrangements iand combination of parts as.. will more fully hereinafter appear.

. In thedrawlngs; Fi lthrough a controlling device embodying my invention,

Fig. 2 is a top plan view of the parts shown in Fig. 1.

In the construction shown infthe drawings, A designates the frame and T5 the ei:-4 pansiblc diaphragm which at itslower end is supported on a spider or plate member C. The latter is secured to the frame member i A by suitable bolts D extending through legs or bearing members E. 4At its central portubular stem though the invention in its broa er4 gure 1 is a vertical sectional viewV speemeam of neaerratat, Patented May 10, 1921.l applicano nea nays, lele. sermon.' 167,422.

tion the'casing A is provided with an inverted cup-shaped member F which'is aperturetl'at its uppxr end and'providcd with a tubular stem" ThisV stemis exteriorly vthreudeflatfd., and interiorly threaded at H there bein? ,a longitudinallyLad'ustable Thus upon 'turning the head 4M of the or'from the diaphragm B.

The stem in, turn-forms a bearing for thev longitudmall-ad'ustable rod N the lower lend of whic ro 1s secured to 'ashoul- .der or abutment member B on the expansible'diaphragm` B. .At its upper end the rod Nterminates adjacent and in aline-ment with-"the operating stem O of-a push button switch O'. This switch is carried by a support Pscrew threaded onto the stemG and can be locked in various positions of ad' ustment b -a lock'nut P. Arms P2 an P, refera Iy formed integrl'withthe su port carry a bearing member P* into whirgi the i .su ort for the switch 0 screw threaded.

A ormall i positioned 'within t e stemfr and havmg'threads I engaging the threads elipansion of the diaphragm will the detailed arrangement of which forms no part of the present invention since any electrically or manually operated device capable of use with refrigerating apparatus, can be em Jloyd,

he present invention however particu` larly contemplates the Ause .of a diaphragm,4

of a fluid having a relatively low boiling point, so that wheres. temperature-below that at which water4 freezes is desired, a

saturated vapor can still be employed for operating the switch.- For this purpose I have found that sulfur dioxid is particularly well adapted since it boils at about 14 F ahrenhe'it when unde'r atmospheric pressure and an increase in temperature produces a definite increase in pressure;

For maintaining thc pressure on the diaphragm, a spring R is employed, one end of spring abutting;I against 'the ensur- 'faee'of thediaphragm and thejoter end againstan abutment R onV the end -zo the stem L. .'Thu's the tension of the spring can bevaried-and also the distance between they -enfl .of the rod N andthe stern O of the I the desired qualities 4might be substitute therefor. within the scopeofmy intention.

VVihat I c laim as` my irrfntlon is; Ina temperature een rolling ex ansion of the latter. n y fn testimony whereof I aiiix my signature. Y I device, the veomltlination with a- 1therxmnxtat having a; HAROLD E. CHURCHILL,

heat responsive member, of a rod: longitudfe. v

nally. ,aetuab1e by said member, a :e

fori Sad member," a `tubulin? Stem mol-mi 20 on said'casing surrounding .said rodi-,ta se`e,

ond tubular 'stem embracing said rdwith'ii the first mentioned tubular stemv end .longitudnall i adjustable therein, a mounting longitudii stem, a member geable by said rod car-l ried by said mounting, anabutment carried by the inner stem izvithin 'said casing vand 'spring compressed between said abutment j and the heat responsive memberV 10 nelly adjustable upon the outer $54 

